SigOp and orphan-tx constants and counts are always unsigned.

Fixes several sign-comparison warnings.

src/main.cpp

@@ -195,9 +195,9 @@ void static EraseOrphanTx(uint256 hash)
     mapOrphanTransactions.erase(hash);
 }
 
-int LimitOrphanTxSize(int nMaxOrphans)
+unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
 {
-    int nEvicted = 0;
+    unsigned int nEvicted = 0;
     while (mapOrphanTransactions.size() > nMaxOrphans)
     {
         // Evict a random orphan:
@@ -328,10 +328,10 @@ bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
     return true;
 }
 
-int
+unsigned int
 CTransaction::GetLegacySigOpCount() const
 {
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(const CTxIn& txin, vin)
     {
         nSigOps += txin.scriptSig.GetSigOpCount(false);
@@ -1079,12 +1079,12 @@ int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
 
 }
 
-int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
+unsigned int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
 {
     if (IsCoinBase())
         return 0;
 
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     for (unsigned int i = 0; i < vin.size(); i++)
     {
         const CTxOut& prevout = GetOutputFor(vin[i], inputs);
@@ -1284,7 +1284,7 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
 
     map<uint256, CTxIndex> mapQueuedChanges;
     int64 nFees = 0;
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(CTransaction& tx, vtx)
     {
         nSigOps += tx.GetLegacySigOpCount();
@@ -1645,7 +1645,7 @@ bool CBlock::CheckBlock() const
         if (!tx.CheckTransaction())
             return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
 
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(const CTransaction& tx, vtx)
     {
         nSigOps += tx.GetLegacySigOpCount();
@@ -2583,9 +2583,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             AddOrphanTx(vMsg);
 
             // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
-            int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
+            unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
             if (nEvicted > 0)
-                printf("mapOrphan overflow, removed %d tx\n", nEvicted);
+                printf("mapOrphan overflow, removed %u tx\n", nEvicted);
         }
         if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
     }
@@ -3209,7 +3209,7 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
                 continue;
 
             // Legacy limits on sigOps:
-            int nTxSigOps = tx.GetLegacySigOpCount();
+            unsigned int nTxSigOps = tx.GetLegacySigOpCount();
             if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                 continue;
 

src/main.h

@@ -28,8 +28,8 @@ class CNode;
 
 static const unsigned int MAX_BLOCK_SIZE = 1000000;
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
-static const int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
-static const int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
+static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
+static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
 static const int64 MIN_TX_FEE = 50000;
 static const int64 MIN_RELAY_TX_FEE = 10000;
 static const int64 MAX_MONEY = 21000000 * COIN;
@@ -495,7 +495,7 @@ public:
         @return number of sigops this transaction's outputs will produce when spent
         @see CTransaction::FetchInputs
     */
-    int GetLegacySigOpCount() const;
+    unsigned int GetLegacySigOpCount() const;
 
     /** Count ECDSA signature operations in pay-to-script-hash inputs.
 
@@ -503,7 +503,7 @@ public:
         @return maximum number of sigops required to validate this transaction's inputs
         @see CTransaction::FetchInputs
      */
-    int GetP2SHSigOpCount(const MapPrevTx& mapInputs) const;
+    unsigned int GetP2SHSigOpCount(const MapPrevTx& mapInputs) const;
 
     /** Amount of bitcoins spent by this transaction.
         @return sum of all outputs (note: does not include fees)

src/script.cpp

@@ -1360,9 +1360,9 @@ bool IsStandard(const CScript& scriptPubKey)
 }
 
 
-int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
+unsigned int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
 {
-    int nResult = 0;
+    unsigned int nResult = 0;
     BOOST_FOREACH(const valtype& pubkey, pubkeys)
     {
         CBitcoinAddress address;
@@ -1566,9 +1566,9 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig
     return true;
 }
 
-int CScript::GetSigOpCount(bool fAccurate) const
+unsigned int CScript::GetSigOpCount(bool fAccurate) const
 {
-    int n = 0;
+    unsigned int n = 0;
     const_iterator pc = begin();
     opcodetype lastOpcode = OP_INVALIDOPCODE;
     while (pc < end())
@@ -1590,7 +1590,7 @@ int CScript::GetSigOpCount(bool fAccurate) const
     return n;
 }
 
-int CScript::GetSigOpCount(const CScript& scriptSig) const
+unsigned int CScript::GetSigOpCount(const CScript& scriptSig) const
 {
     if (!IsPayToScriptHash())
         return GetSigOpCount(true);

src/script.h

@@ -491,11 +491,11 @@ public:
     // CHECKMULTISIGs serialized in scriptSigs are
     // counted more accurately, assuming they are of the form
     //  ... OP_N CHECKMULTISIG ...
-    int GetSigOpCount(bool fAccurate) const;
+    unsigned int GetSigOpCount(bool fAccurate) const;
 
     // Accurately count sigOps, including sigOps in
     // pay-to-script-hash transactions:
-    int GetSigOpCount(const CScript& scriptSig) const;
+    unsigned int GetSigOpCount(const CScript& scriptSig) const;
 
     bool IsPayToScriptHash() const;
 

src/test/DoS_tests.cpp

@@ -14,7 +14,7 @@
 
 // Tests this internal-to-main.cpp method:
 extern void AddOrphanTx(const CDataStream& vMsg);
-extern int LimitOrphanTxSize(int nMaxOrphans);
+extern unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans);
 extern std::map<uint256, CDataStream*> mapOrphanTransactions;
 extern std::multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;